[ci] Update github caching to be more similar to drake-blender

- Ensure we use changing cache keys s.t. we actually update the cache
- Update caching paths

.github/ci.bazelrc

@@ -1,15 +1,17 @@
 # This is symlinked by `./workflows/bazelized*.yml` actions in order to alter
-# Bazel's configuration for CI. This is similar to Drake's CI configuration:
-# https://github.com/RobotLocomotion/drake-ci/blob/0f2c2158/user.bazelrc#L42
+# Bazel's configuration for CI. This is similar to drake-blender's CI
+# configuration:
+# https://github.com/RobotLocomotion/drake-blender/blob/c4a33f80/.github/ci.bazelrc
 
+# Dump configuration details to the log.
 common --announce_rc=yes
+
 common --experimental_ui_max_stdouterr_bytes=5242880
 common --keep_going=yes
-
 test --test_summary=short
 
 # Paths for caching Bazel externals and disk cache.
-fetch --repository_cache /home/runner/.cache/ci/bazel_externals
-build --repository_cache /home/runner/.cache/ci/bazel_externals
-fetch --disk_cache /home/runner/.cache/ci/bazel_local_disk
-build --disk_cache /home/runner/.cache/ci/bazel_local_disk
+fetch --repository_cache /home/runner/.cache/bazel_ci/bazel_externals
+build --repository_cache /home/runner/.cache/bazel_ci/bazel_externals
+fetch --disk_cache /home/runner/.cache/bazel_ci/bazel_local_disk
+build --disk_cache /home/runner/.cache/bazel_ci/bazel_local_disk

.github/workflows/bazelized.yml

@@ -20,13 +20,23 @@ jobs:
       # See https://stackoverflow.com/a/73613377/7829525
       options: --cap-add=SYS_PTRACE --security-opt seccomp=unconfined
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
+      # Caching.
+      # See comments in drake-blender for more details:
+      # https://github.com/RobotLocomotion/drake-blender/blob/c4a33f80/.github/workflows/main.yml
       - uses: actions/cache@v3
         with:
-          path: "/home/runner/.cache/ci"
-          key: bazel
+          path: "/home/runner/.cache/bazel_ci"
+          # We want this key to change to ensure we store the updated cache.
+          key: bazel_ci-${{ github.ref }}-${{ github.run_number }}-${{ github.run_attempt }}
+          restore-keys: |
+            bazel_ci-${{ github.ref }}-
+            bazel_ci-refs/heads/main-
       - name: Check cache
-        run: du -hs $(readlink -f /home/runner/.cache/ci)
+        run: du -hs $(readlink -f /home/runner/.cache/bazel_ci) || true
+
+      # Setup.
       - name: Simplify apt upgrades
         run: .github/simplify_apt_and_upgrades.sh
       - name: Configure Bazel for CI (bazel_ros2_rules)

.github/workflows/bazelized_drake_ros.yml

@@ -15,13 +15,23 @@ jobs:
     if: "! contains(github.event.pull_request.labels.*.name, 'status: defer ci')"
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
+      # Caching.
+      # See comments in drake-blender for more details:
+      # https://github.com/RobotLocomotion/drake-blender/blob/c4a33f80/.github/workflows/main.yml
       - uses: actions/cache@v3
         with:
-          path: "/home/runner/.cache/ci"
-          key: bazel
+          path: "/home/runner/.cache/bazel_ci"
+          # We want this key to change to ensure we store the updated cache.
+          key: bazel_ci-${{ github.ref }}-${{ github.run_number }}-${{ github.run_attempt }}
+          restore-keys: |
+            bazel_ci-${{ github.ref }}-
+            bazel_ci-refs/heads/main-
       - name: Check cache
-        run: du -hs $(readlink -f /home/runner/.cache/ci)
+        run: du -hs $(readlink -f /home/runner/.cache/bazel_ci) || true
+
+      # Setup.
       - name: Simplify apt upgrades
         run: .github/simplify_apt_and_upgrades.sh
       - name: Configure drake_ros Bazel for CI